KDP, DKDP and ADP Crystal and Devices

KDP, Potassium Dihydrogen Phosphate (KH2PO4), and its isomorphic single crystals, Deuterated Potassium Phosphate, known as DKDP or KD*P (KD2PO4),
and Ammonium Dihydorgen Phosphate, known as ADP (NH4H2PO4), are the most common NLO and E-O crystals, especially in the systems with the large apertures.